Distributed data, having been stored in a distributed storage system as a collection of distributed data elements, is recovered based on connection of multiple user nodes, each user node having stored selected distributed data elements as a corresponding portion of the distributed data during replication of the distributed data elements throughout the distributed storage system. One end of a sample is connected to each drum, and the drums are rotated, stretching the sample until the sample breaks. A drainage channel formed in the adhesive layer by the exclusion of adhesive from a selected area of the sheet extending radially outward from the collection chamber to a drain outlet at a peripheral edge of the sheet to drain fluid from the collection chamber. The panel comprises a second communication unit including a memory storing predetermined information.